Moved the SIO files to a new sio/ folder.
Added the 'version.h'stuff, added Makefile rule to generate the Manifest file for Windows.
Re-worked the About dialog - it now includes more info.
Several cleanups and fixes here and there.
Updated (Windows) UI to properly handle resets and changes in Settings.
Updated to no longer scan for roms at startup.
wsprintf() is deprecated, has a potential for buffer overflows (no
length parameter), and doesn't handle 64-bit format strings (%llu and
friends) at all. Three good reasons to get rid of it...
